/*
 * Copyright (c) 2021, 2022 Oracle and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.helidon.metrics.exemplartrace;

import io.helidon.common.context.Contexts;
import io.helidon.metrics.ExemplarService;
import io.helidon.tracing.SpanContext;

/**
 * Service provider for {@link io.helidon.metrics.ExemplarService}.
 */
public class TraceExemplarService implements ExemplarService {
    @Override
    public String label() {
        return Contexts.context()
                .flatMap(c -> c.get(SpanContext.class))
                .map(sc -> "trace_id=\"" + sc.traceId() + "\"")
                .orElse("");
    }
}
